Possible materials and production technologies for a Special Purpose Helical Torsion Spring

There are a huge number of ideas at the area of traction drives and also at that of the epicyclic or by other words, planetary drives. The majority of these designs, contain solely rigid wheels, and the contact forces that are proportional to the transmitted torque are produced by separate clamping devices. The author introduced an innovative design, which integrates some elements with merging functions. A part of the contacting rollers are elastic ones and their shape assures the requirement of uniform strength. The curiosities of the elastic rollers are their shapes. Observing both their shapes and loads, they are helical torsion springs. They can be made of pure metals and composites, so of spring steel and also from fiber-reinforced plastics. There is a wide range of production technology considered depending on individual or mass production. The author has received some ideas from the areas of helical spring bearings, the machined torsion springs and the fiber-reinforced tubes. He also find a method to coil helical torsion spring of uniform strength from sheet metal, making the pre-manufactured “wire” of changing width by laser cutting, and to cut tubes by spark cutting.